The PDF combines three technologies: A subset of the PostScript page description programming language, for generating the layout and graphics. In Microsoft Office 2007 the binary file formats were replaced as the default format by the new XML based Office Open XML formats. Microsoft PowerPoint up until 2007 version used a proprietary binary file format called PowerPoint Binary File Format (.PPT) as its primary format. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Application/pdf, application/x-pdf, application/x-bzpdf, application/x-gzpdf
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